Vanilla TypeScript FSK encoding with quadrature discriminator—modem audio from scratch, no libraries.
Ham radio enthusiasts, retro/nostalgia computing hobbyists, audio signal processing nerds
A fun weekend project: https://www.modembin.com
It's a pastebin, except text/files are encoded into .wav files using real FSK modem audio. Image sharing is supported via Slow-Scan Television (SSTV), a method of transmitting images as FM audio originally used by ham radio operators.
Everything runs in the browser with zero audio libraries and the encoding is vanilla TypeScript sine wave math: phase-continuous FSK with proper 8-N-1 framing, fractional bit accumulation for non-integer sample rates, and a quadrature FM discriminator on the decode side (no FFT windowing or Goertzel), The only dependency is lz-string for URL sharing compression.
It supports Bell 103 (300 baud), Bell 202 (1200 baud), V.21, RTTY/Baudot, Caller ID (Bellcore MDMF), DTMF, Blue Box MF tones, and SSTV image encoding. There's also a chat mode where messages are transmitted as actual Bell 103 audio over WebSocket... or use the acoustic mode for speaker-to-mic coupling for in-room local chat.
Phase-continuous FSK with quadrature FM discriminator, zero audio libraries, pure TypeScript sine wave math.
YouTube video review, not a shipped project with code or tooling.
Yet another audio cutter when mp3cut.net and AudioTrimmer already exist.
Synthesizes modem sounds via Web Audio API instead of loading external audio files.
Keystroke + audio forensics for authorship proof, but keystroke spoofing is researched and brittle.
Free audio-to-video generator, but Runway and HeyGen already dominate this space.
![Encoding Audio Inside PNG Images [video]](/screenshots/48408599_thumb.webp)
